He initially gave a brief statement to the New York Times in which he said he had not seen the broadcast, but was unsurprised to have come under "attack from 'liberal movie people.'" And then, the next morning, with all the regularity of Old Faithful geyser (or, more aptly, of menstrual cramps), Trump began his inevitable wounded early morning Tweetstorm.

Where to begin? The unpresidented problem of having a future commander-in-chief who is apparently unwilling or unable to use spell check? (There's no hyphen in "overrated," a mistake understandable for a regular citizen on Twitter, but not, I'd argue, for someone about to have the nuclear launch codes.)

Moreover, all of the president's public communications are relevant to diplomacy. When Trump impulsively posts criticisms of a foreign leader or foreign country, he creates the impression that his belief is reflective of his administration as a whole. A tweet from the president is still a public statement from the head of state — and the childish way in which Trump expresses himself online will have real diplomatic consequences for the United States.